Plant Growth and Structure Concepts

The video explains the concepts of primary and secondary growth in plants, focusing on the role of apical and lateral meristems. It details the formation and function of vascular cambium and cambium rings, leading to the development of secondary xylem and phloem. The video also covers the differences between springwood and atom wood, and the characteristics of heartwood and sapwood, highlighting their roles in plant structure and function.

What is the primary function of apical meristem in plant growth?

• Formation of flowers

• Increase in girth

• Increase in length

• Production of seeds

Which tissue is responsible for the increase in girth of dicotyledonous plants?

• Vascular cambium

• Apical meristem

• Cork cambium

• Primary xylem

What does the cambium ring primarily produce more of?

• Primary xylem

• Secondary phloem

• Secondary xylem

• Primary phloem

What are secondary medullary rays?

• Zones of primary phloem

• Regions of cork cambium

• Layers of primary xylem

• Bands of parenchyma in radial directions

During which season is the cambium most active?

• Winter

• Autumn

• Summer

• Spring

What is the characteristic of autumn wood compared to spring wood?

• Lighter in color

• Higher density

• Wider vessels

• More porous

What do annual rings in a tree indicate?

• The height of the tree

• The type of tree

• The age of the tree

• The health of the tree

What makes heartwood different from sapwood?

• It is lighter in color

• It conducts water

• It is located on the outer part of the stem

• It is resistant to microorganisms

Which part of the tree is primarily involved in water conduction?

• Heartwood

• Sapwood

• Cork cambium

• Primary phloem

What substances are deposited in heartwood to make it durable?

• Chlorophyll

• Tannins and oils

• Proteins

• Starch